I'm not familiar with the MENA (Middle East North Africa) beneficiary requirements being any different to USCIS?
For Part 2, Item 54, it sounds like you two have met in person within the past 2 years. So list the dates when you two met and list the copies of the evidence for those dates like boarding passes, flight receipts, photos, etc. and include in the I-129F. Put in Part 8, Additional Information if you need more space.
For the interview, take all the original evidence in case the consulate asks for them. The interview comes down to is the beneficiary familiar enough with the US citizen to marry and can the US petitioner support the beneficiary? Does the beneficiary know your work or how much you make (from I-134)? Know your family members? Does the US citizen know the beneficiary’s family members? Specific details of first meeting like when or where or what, etc.? Specific details of the relationship like special dates you two celebrate, or religious conflicts, chat logs? etc.
Trust me, the wait and the interview is too stressful to fabricate a relationship. The consulate staff is trained to spot fake relationships. They may ask questions they already know the answers to see how the beneficiary answers? Best to keep everything truthful and simple to prove bona fide relationship.
Pro tip: while waiting for the USCIS approval and for the interview, spend the time getting to know each other deeply. Be conscious of the details of how your relationship is developing, etc.